Accession Number:

AD0832912

Title:

TRAFFICABILITY OF SOILS. SUPPLEMENT NO. 18, DEVELOPMENT OF REVISED MOBILITY INDEX FORMULA FOR SELF-PROPELLED WHEELED VEHICLES IN FINE-GRAINED SOILS

Descriptive Note:

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s):

• Kennedy, James G.
• Rush, Edgar S.

Report Date:

1968-03-01

Pagination or Media Count:

92.0

Abstract:

In 1955, formulas for computing mobility indexes MI and converting them to vehicle cone indexes VCI, or minimum soil strength required for 50- pass go-no go, for current military wheeled and tracked vehicles were reported. Subsequent trafficability tests with vehicles having construction-equipment-type tires showed that the computed VCI did not agree closely with test results. To obtain data to determine whether the MI formula for self-propelled wheeled vehicles needed modification, field tests were run with small vehicles equipped with large, high-flotation tires, very large vehicles with very heavy wheel loads, and a few conventional vehicles. Main test purposes were to obtain data to determine experimentally 50-pass VCI for some untested vehicles and from these and other test results develop an MI formula for a wide range of vehicle weights and tire sizes. Although only 16 vehicles were tested, VCIs were determined for 20 vehicle types. To determine if VCI prediction could be improved, a statistical analysis was made on both the original and revised MI formulas using a multiple linear regression technique.

Descriptors:

• *SOILS
• CLASSIFICATION
• EQUATIONS
• ERRORS
• INDEXES
• MATHEMATICAL PREDICTION
• MILITARY REQUIREMENTS
• MOBILITY
• PARTICLE SIZE
• REGRESSION ANALYSIS
• SOIL MECHANICS
• STATISTICAL ANALYSIS
• TABLES(DATA)
• TIRES
• TRACKED VEHICLES
• TRAFFICABILITY
• VEHICLES
• WEIGHT

Subject Categories:

• Soil Mechanics
• Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE